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XML and JAVA

I have two xml files. One contains all the information about courses of a department and the other contains class time, exam time, labs etc of each courses.

The first file remains fixed i.e it's never changed (A department rarely changes it's courses). But the other one changes every semester (not all the courses of the first file are offered every semester). The common thing about both files is that both have course id.

Now I need a way to display information about the offered courses (from the second file) taking some of the information from the first file.

The second link looks like a link to XML stuff for the web. What is the intended viewing method for this information. If it is on the web and you are planning on using xsl, then you probably don't need java at all. If you need the information in a java program, then the best way would probably be for the program to generate a single xml file with the combined information.